An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an α-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured by 13C-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an α-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT) > 12.9 - 7.15 × SR; and the intrinsic viscosity ([η]) and the melt flow rate (MFR) satisfy the relation; [η] > 1.85 × MFR-0.192 in the case of MFR < 1 and the relation; [η] > 1.85 × MFR-0.213 in the case of MFR ≥ 1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.
本发明的
乙烯(共)聚合物是一种具有优异成型性和机械性能的(共)聚合物,可以是
乙烯均聚物,也可以是
乙烯与 4 至 20 个碳原子的 α 烯烃的共聚物。通过 13C-NMR 测量,(共)聚合物的甲基分支数量少于 0.1 个/1,000 个碳原子,通过
GPC 测量,Mw/Mn 不低于 1.8 也不低于 4.5。共)聚合物是
乙烯均聚物或
乙烯与 3 至 20 个碳原子的 α 烯烃的共聚物。熔体张力(
MT)和溶胀比(SR)符合以下关系:log(
MT) > 12.9 - 7.15 × SR;固有粘度([η])和熔体流动速率(MFR)符合以下关系:[η] > 1.85 × MFR-0.192 (MFR 1.85 × MFR-0.213 )(MFR ≥ 1)。这种
乙烯(共)聚合物可用于各种成型应用,尤其适用于管道。